The spec for resource sharing never discusses a status code for a
failed. It just says, 'terminate'.
To me, this suggests that, if there is no other OPTIONS processing
going on, the net result will be a NOT FOUND.
For that matter, it occurs to me, even if the entire preflight is a
success, the status code will still be not found, won't it, if there
is no other OPTIONS handler for the resource?
Am I misinterpreting?